On Wed, May 07, 2008 at 03:31:03PM -0700, Andrew Morton wrote: > Nope. We only need to take the global lock before taking *two or more* of > the per-vma locks. > > I really wish I'd thought of that.
I don't see how you can avoid taking the system-wide-global lock before every single anon_vma->lock/i_mmap_lock out there without mm_lock. Please note, we can't allow a thread to be in the middle of zap_page_range while mmu_notifier_register runs. vmtruncate takes 1 single lock, the i_mmap_lock of the inode. Not more than one lock and we've to still take the global-system-wide lock _before_ this single i_mmap_lock and no other lock at all. Please elaborate, thanks! _______________________________________________ general mailing list [email protected] http://lists.openfabrics.org/cgi-bin/mailman/listinfo/general To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general
